CN204111219U - A kind of hoisting crane and jib thereof - Google Patents
A kind of hoisting crane and jib thereof Download PDFInfo
- Publication number
- CN204111219U CN204111219U CN201420514082.7U CN201420514082U CN204111219U CN 204111219 U CN204111219 U CN 204111219U CN 201420514082 U CN201420514082 U CN 201420514082U CN 204111219 U CN204111219 U CN 204111219U
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- CN
- China
- Prior art keywords
- joint
- auxiliary
- swivel joint
- principal arm
- jib
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Abstract
The utility model discloses a kind of hoisting crane and jib thereof, described jib comprises principal arm and auxiliary, and both arm heads are separately installed with interior principal arm joint and interior auxiliary joint; Also comprise swivel joint, itself and described interior principal arm joint have the connecting bore cooperatively interacted; And described swivel joint is movably connected in described interior auxiliary joint, to make it have two switchable states: the first state, described swivel joint is fixedly connected with described interior auxiliary joint; Second state, described swivel joint and described interior auxiliary joint hinged, rotate to the connecting bore of its connecting bore with described interior principal arm joint to enable described swivel joint and align.The setting of said arm shelf structure can simplify the switching process of auxiliary state, and improves the safety of operation.
Description
Technical field
The utility model relates to technical field of engineering machinery, particularly relates to a kind of hoisting crane and jib thereof.
Background technology
At present, car hosit polygamy has auxiliary, with increasing degree, improves scope of work and the operation height of hoisting crane.
Auxiliary is traditionally arranged to be two joints, certainly also can be set to a joint.The matching relationship of auxiliary and principal arm is described for two joint auxiliarys below.
Please refer to Fig. 1-2, Fig. 1 shows jib structure schematic diagram when auxiliary is in suspension status; Fig. 2 show auxiliary in running order time jib structure schematic diagram.
Auxiliary 2 ＇ has two states: one is inoperative suspension status, now, auxiliary 2 ＇ by bracket component 3 ＇ (comprising front frame 31 ＇, medium-height trestle 32 ＇ and after poppet 33 ＇) being fixedly arranged on main arm of crane 1 ＇ realize full degree of freedom constraint, with guarantee auxiliary 2 ＇ reliable and stable be fixed on principal arm 1 ＇; Another kind be with principal arm 1 ＇ with the use of mode of operation, now, the partially restrained between auxiliary 2 ＇ and principal arm 1 ＇ need be removed, auxiliary 2 ＇ be rotated to its arm head and docks with principal arm arm head.
Control step when auxiliary 2 ＇ is converted to mode of operation by suspension status is as follows:
First remove the constraint of after poppet 33 ＇ and medium-height trestle 32 ＇; Need to ascend a height operation;
Then pull auxiliary 2 ＇ afterbody, make auxiliary 2 ＇ around front frame centre of gration O
3rotate, until the nipple orifice O of auxiliary joint 21 ＇
2with the through axial bore O of axis 11 ＇ (being located at the arm head of principal arm 1 ＇)
1overlap; Jib structure under this state can with reference to figure 3;
Now, auxiliary 2 ＇ is pulled to keep nipple orifice O
2with through axial bore O
1be in coincidence status, a bearing pin is inserted nipple orifice O
2with through axial bore O
1(operation of ascending a height), this bearing pin takes out front frame centre of gration O after inserting
3the S. A. (operation of ascending a height) at place;
Again pull auxiliary 2 ＇ afterbody, make auxiliary 2 ＇ around centre of gration O
12(i.e. nipple orifice O
2with through axial bore O
1overlapping positions, use O
12represent) rotate, until auxiliary joint 21 ＇ all overlaps with the corresponding hinge hole on axis 11 ＇, insert bearing pin (operation of ascending a height) respectively, realize docking of principal arm 1 ＇ and auxiliary 2 ＇.
When auxiliary 2 ＇ is converted to suspension status by mode of operation, according to above-mentioned reverse operating.
There is following technical matters in such scheme:
Each conversion needs twice rotation of the first, auxiliary 2 ＇ state, plug bearing pin of ascending a height for four times; Switching process is relatively loaded down with trivial details, and frequent ascend operation has certain danger;
The second, axis 11 ＇ and auxiliary joint 21 ＇ apart from front frame centre of gration O
3distant, Long-Time Service collision and hoisting crane are walked and are jolted the location of bracket component 3 ＇ will certainly be caused to change, thus cause axis 11 ＇ to dock difficulty with auxiliary joint 21 ＇;
3rd, if when the minor details arm of principal arm 1 ＇ cannot be retracted into assigned address smoothly, docking of auxiliary 2 ＇ and principal arm 1 ＇ cannot be realized.
In view of this, how to simplify the switching process of auxiliary state, improving processing safety, is the current technical issues that need to address of those skilled in the art.
Utility model content
The purpose of this utility model is to provide a kind of hoisting crane and jib thereof, and this jib structure can simplify the switching process of auxiliary state, and improves processing safety.
The jib of the hoisting crane that the utility model provides, comprises principal arm and auxiliary, and both arm heads are separately installed with interior principal arm joint and interior auxiliary joint;
Also comprise swivel joint, itself and described interior principal arm joint have the connecting bore cooperatively interacted; And described swivel joint is movably connected in described interior auxiliary joint, to make it have two switchable states:
First state, described swivel joint is fixedly connected with described interior auxiliary joint;
Second state, described swivel joint and described interior auxiliary joint hinged, rotate to the connecting bore of its connecting bore with described interior principal arm joint to enable described swivel joint and align.
As above design, when auxiliary is in inoperative suspension status, make swivel joint be in the first state, namely itself and interior auxiliary joint are affixed; When auxiliary is converted to mode of operation by inoperative suspension status, make swivel joint be in the second state, namely swivel joint and interior auxiliary joint hinged, rotate swivel joint, its connecting bore is alignd with the connecting bore of interior principal arm joint, insertion locations; Then the institute's Constrained between auxiliary and principal arm is removed, pull auxiliary afterbody, auxiliary can rotate around aforementioned locations, rotates when all aliging to auxiliary with the connecting bore matched of principal arm, insert locations respectively in the connection hole of each coupling, namely define the relative position of auxiliary and principal arm.
Obviously, after arranging swivel joint, the state conversion process of auxiliary only needs a spinning movement, and correspondingly, decrease the number of times of operation of ascending a height, compared with background technology, switching process is simplified, and due to number of operations minimizing of ascending a height, improves the safety of operation.
Preferably, described swivel joint is also provided with two pin-and-holes, coordinates respectively, form two groups of pin-and-holes with two pin-and-holes of described interior auxiliary joint;
Described swivel joint is in the first state, and it runs through two groups of pin-and-holes respectively by two locationss and realizes and being fixedly connected with of described interior auxiliary joint;
Described swivel joint is in the second state, and it runs through in two groups of pin-and-holes one group by a jointed shaft, and to realize with described interior auxiliary joint hinged.
Preferably, described swivel joint is platy structure, and two described pin-and-holes are located at the first end of described swivel joint side by side, and described connecting bore is located at the second end of described swivel joint.
Preferably, the first end of described swivel joint is individual layer plate body, and the second end of described swivel joint is the double-deck plate body be arranged in parallel.
Preferably, described swivel joint is Forging Parts or Casting Parts.
Preferably, also comprise bracket component, it is fixedly arranged on described principal arm side; Off working state, described auxiliary is supported by described bracket component and retrains.
Preferably, described bracket component comprises the front frame of close described principal arm arm head and the medium-height trestle be positioned in the middle part of described principal arm; Described auxiliary can rotate around described front frame, and its rotary centerline is horizontally disposed with and perpendicular to the length direction of described principal arm.
Preferably, described bracket component also comprises the after poppet near described principal arm arm tail.
The utility model also provides a kind of hoisting crane, and comprise chassis and be positioned at the jib on described chassis, described jib is the jib described in above-mentioned any one.
Because above-mentioned jib has above-mentioned technique effect, the hoisting crane with this jib also has identical technique effect.
Accompanying drawing explanation
Fig. 1 shows the structural representation of jib when auxiliary in prior art is in suspension status;
The structural representation of jib when Fig. 2 shows that in prior art, auxiliary is in running order;
Fig. 3 shows the structural representation of jib when auxiliary in prior art is converted to mode of operation by suspension status;
Fig. 4 shows the structural representation of jib when auxiliary in specific embodiment is in off working state;
Fig. 5 is the structural representation at auxiliary and principal arm arm head place in Fig. 4;
Fig. 6 is the structural representation of swivel joint in Fig. 4;
The structural representation of jib when Fig. 7 shows that in specific embodiment, swivel joint and principal arm overlap;
The structural representation of jib when Fig. 8 shows that in specific embodiment, auxiliary is in running order;
The structural representation of jib when Fig. 9 shows limit compensating coefficient.
In Fig. 1-3:
Principal arm 1 ＇, axis 11 ＇, auxiliary 2 ＇, auxiliary joint 21 ＇, bracket component 3 ＇, front frame 31 ＇, medium-height trestle 32 ＇, after poppet 33 ＇;
Through axial bore O
1, nipple orifice O
2, centre of gration O
12, front frame centre of gration O
3;
In Fig. 4-9:
Principal arm 10, principal arm joint 11, interior principal arm joint 111, interior principal arm joint connecting bore 111a, outer principal arm joint 112;
Auxiliary 20, auxiliary joint 21, interior auxiliary joint 211, outer auxiliary joint 212;
Bracket component 30, front frame 31, medium-height trestle 32, after poppet 33,
Swivel joint 40, swivel joint connecting bore 40a, the first pin-and-hole 40b, the second pin-and-hole 40c;
First centre of gration C
1, the second centre of gration C
2, front frame centre of gration C
3.
Detailed description of the invention
Core of the present utility model is to provide a kind of hoisting crane and jib thereof, and this jib structure can simplify the switching process of auxiliary state, and improves processing safety.
In order to make those skilled in the art person understand the utility model scheme better, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Please refer to Fig. 4, Fig. 4 shows the structural representation of jib when auxiliary in specific embodiment is in off working state.
In this embodiment, the jib of hoisting crane comprises principal arm 10 and auxiliary 20, wherein, when auxiliary 20 is in inoperative suspension status, is arranged at the side of principal arm 10.
Particularly, the side of principal arm 10 is installed with bracket component 30, off working state, and auxiliary 20 is supported by this bracket component 30 and retrained.
Here constraint refers to, to the constraint of auxiliary 20 degree of freedom, bracket component 30 can realize the full degree of freedom constraint of auxiliary 20 as required, comprise between each arm joint of auxiliary 20 and between auxiliary 20 and principal arm 10, in order to avoid during off working state, auxiliary 20 causes the accident or produces with principal arm 10 rub because other factor actions such as rocking; Certainly, bracket component 30 also can remove the constraint of auxiliary 20 as required, to make auxiliary 20 relatively launch by principal arm 10, and coordinates principal arm 10 to work.
The arm head of principal arm 10 and auxiliary 20 is separately installed with principal arm joint 11 and auxiliary joint 21.Wherein, principal arm joint 11 comprises interior principal arm joint 111 and outer principal arm joint 112, and auxiliary joint 21 comprises interior auxiliary joint 211 and outer auxiliary joint 212.
Interior principal arm joint 111 and interior auxiliary joint 211 are provided with the connecting bore cooperatively interacted, outer principal arm joint 112 and outer auxiliary joint 212 are also provided with the connecting bore cooperatively interacted, so that when auxiliary 20 is converted to mode of operation, principal arm 10 and auxiliary 20 can be connected and fixed by principal arm joint 11 and auxiliary joint 21.
For benchmark definition when also it is pointed out that " interior " and " outward " is here positioned at principal arm side with auxiliary, " interior " refers to auxiliary and principal arm side close to each other, " outward " refer to auxiliary and principal arm mutually away from side; Should be appreciated that use the knowing and conveniently, should not limit the protection domain of the application's request just in order to description scheme of the described noun of locality.
This jib also comprises swivel joint 40, and it has the swivel joint connecting bore 40a coordinated with interior principal arm joint connecting bore 111a; This swivel joint 40 is movably connected in interior auxiliary joint 211, to make it have two switchable states:
First state, swivel joint 40 is fixedly connected with interior auxiliary joint 211;
Second state, swivel joint 40 is hinged with interior auxiliary joint 211, can rotate to swivel joint connecting bore 40a align with interior principal arm joint connecting bore 111a to make swivel joint 40.
Please composition graphs 5 and Fig. 6, Fig. 5 are the structural representation at auxiliary and principal arm arm head place in Fig. 4 in the lump; Fig. 6 is the structural representation of swivel joint in Fig. 4.
In concrete scheme, swivel joint 40 also has the first pin-and-hole 40b and the second pin-and-hole 40c, coordinates respectively, form two groups of pin-and-holes with two pin-and-holes of interior auxiliary joint 211; When swivel joint 40 is in the first state, runs through above-mentioned two groups of pin-and-holes by two locationss and realize and being fixedly connected with of interior auxiliary joint 211; When swivel joint 40 is in the second state, running through in two groups of pin-and-holes one group by a jointed shaft, to realize with interior auxiliary joint 211 hinged.
This kind of vibrational power flow is easy to realize and reliable, and easy to operate.
Wherein, above-mentioned locations and jointed shaft all can select bearing pin.
More specifically in scheme, swivel joint 40 is platy structure, and the first pin-and-hole 40b and the second pin-and-hole 40c is located at the first end of swivel joint 40 side by side, and swivel joint connecting bore 40a is located at the second end of swivel joint 40.
This kind of design, is convenient to the processing of swivel joint 40, and small volume, the existing structure of jib can not be affected.
Further, the first end of swivel joint 40 is individual layer plate body, and the second end is the double-deck plate body be arranged in parallel, and specifically as shown in Figure 6, the side of swivel joint 40 is substantially Y-shaped.Certainly, double-deck plate body offers coaxial aperture, i.e. above-mentioned swivel joint connecting bore 40a.
Setting like this, when swivel joint 40 is connected with interior principal arm joint 111 by the swivel joint connecting bore 40a of the second end, can increase both Joint strenghts, guarantees safety and reliability when auxiliary 20 rotates (can relate to hereinafter).
Please composition graphs 4, Fig. 7 and Fig. 8 in the lump; Wherein, the structural representation of jib when Fig. 7 shows that in specific embodiment, swivel joint and principal arm overlap; The structural representation of jib when Fig. 8 shows that in specific embodiment, auxiliary is in running order.
Jib provided by the utility model, when auxiliary 20 is in off working state, is supported and be constrained in principal arm 10 side by bracket component 30, now, swivel joint 40 is in the first state, is namely fixedly connected with interior auxiliary joint 211, as shown in Figure 4.
Control step when auxiliary 20 is converted to mode of operation by off working state is as follows:
S1, operation make swivel joint 40 be in the second state, and namely swivel joint 40 is hinged with interior auxiliary joint 211; Particularly, take out the bearing pin of the first pin-and-hole 40b position, swivel joint 40 can around the first centre of gration C
1(i.e. the bearing pin of the second pin-and-hole 40c position) rotate, when swivel joint 40 rotate align to swivel joint connecting bore 40a with interior principal arm joint connecting bore 111a time, this position insertion locations; This locations also can select bearing pin; This action need is ascended a height and is carried out;
Institute's Constrained of S2, releasing bracket component 30 pairs of auxiliarys 20, this action need is ascended a height and is carried out; Now, auxiliary 20 can around the second centre of gration C
2(i.e. the bearing pin of swivel joint connecting bore 40a and interior principal arm joint connecting bore 111a position) rotates;
S3, pull auxiliary 20 afterbody, make auxiliary 20 around the second centre of gration C
2rotate, until when auxiliary joint 21 all aligns with the connecting bore matched of principal arm joint 11, insert locations respectively in the connection hole of each coupling, in turn define the relative position of auxiliary 20 and principal arm 10; Certainly, the pin-and-hole that the first pin-and-hole 40b of swivel joint 40 is corresponding with on interior auxiliary joint 211 is also in aligned condition, and this position also reinserts bearing pin, makes swivel joint 40 be in the first state; Now, auxiliary 20 is in running order, as shown in Figure 8.This action need is ascended a height and is carried out.
It is pointed out that in the rotary course of auxiliary 20, swivel joint 40 and have a rotary freedom respectively between interior auxiliary joint 211 and interior principal arm joint, but unnecessary rotary freedom does not affect the rotation of auxiliary 20.
Otherwise, when auxiliary 20 is converted to off working state by mode of operation, according to above-mentioned reverse operating.
Obviously, after swivel joint 40 is set, the state conversion process of auxiliary 20 only needs a spinning movement, ascend a height for three times operation, with twice spinning movement in background technology, four operations of ascending a height are compared, the switching process of auxiliary 20 state is simplified, and the number of times of operation of ascending a height reduces, and reduces the danger of ascend operation, improves the safety and reliability of operation.
In addition, because swivel joint 40 can rotate by internal auxiliary joint 211 mutually, there is certain adjustment nargin, even if Long-Time Service collision and hoisting crane walking are jolted, also swivel joint connecting bore 40a can not be caused cannot to align with interior principal arm joint connecting bore 111a, can to avoid in background technology, because of centre of gration variation when auxiliary launches, cause auxiliary to dock difficult situation with principal arm and occur, thus the reliability of this jib structure being higher.
Usually, by the restriction of jib structure, auxiliary 20 comprises at most two joint auxiliarys.
In concrete scheme, bracket component 30 comprises the front frame 31 arranged near principal arm 10 arm head, and is positioned at the medium-height trestle 32 in the middle part of principal arm 10; Further, auxiliary 20 can rotate around front frame 31, and its rotary centerline is horizontally disposed with and perpendicular to the length direction of principal arm 10.
Wherein, front frame 31 is for supporting and retraining a joint auxiliary of auxiliary 20, and medium-height trestle 32 is for supporting and retraining a joint auxiliary and the two joint auxiliarys of auxiliary 20, and can overcome auxiliary 20 sagging and front frame 31 that is that cause is difficult to the problem of assembling by gravity factor simultaneously.
Further, bracket component 30 also comprises the after poppet 33 near principal arm 10 arm position; After poppet 33 the reliability that can increase auxiliary 20 integral hanging is set, and the reliability of docking when stability when can guarantee that two joint auxiliary independent suspensions are on principal arm 10 and a joint auxiliary reclaim.
In addition, in actual use, when the minor details arm of principal arm 10 cannot be retracted into assigned address smoothly, the assembling of auxiliary 20 and principal arm 10 can be realized by the rotation of swivel joint 40 and auxiliary 20 around the composite move that front frame 31 rotates.
Minor details arm due to principal arm 10 is not retracted and is put in place, interior principal arm joint 111 cannot get back to desired location, if when still rotating swivel joint 40 according to abovementioned steps, the swivel joint connecting bore 40a of swivel joint 40 cannot align with interior principal arm joint connecting bore 111a, now, first can pull auxiliary 20 arm tail, make it around front frame centre of gration C
3rotate, rotate swivel joint, both interoperations simultaneously, finally realize swivel joint connecting bore 40a and align with interior principal arm joint connecting bore 111a.
When being appreciated that the minor details arm of principal arm 10 is not retracted completely within the scope of certain distance, just realize the assembling of auxiliary 20 and principal arm 10 by aforesaid way.For ease of describing, this distance is called the complementary range of swivel joint 40.
Please refer to Fig. 9, the structural representation of jib when Fig. 9 shows limit compensating coefficient.When auxiliary 20 is around front frame centre of gration C
3when rotating to position shown in Fig. 9, the distance that can compensate is maximum, is the distance between swivel joint connecting bore 40a and the second pin-and-hole 40c.
In addition, swivel joint 40 can be Forging Parts, adopts Forging Technology manufacture, potential endurance crack source can be reduced, eliminate safe hidden trouble, thus effectively improve the reliability of jib, further, the fatigue limit of Forging Parts is higher, also can improve the fatigue life of swivel joint 40.Certainly, swivel joint 40 also can be set to Casting Parts.
Except the jib of above-mentioned hoisting crane, the utility model also provides a kind of hoisting crane, and comprise chassis and be positioned at the jib on described chassis, described jib is aforementioned described jib.
Because aforementioned jib has aforementioned techniques effect, so the hoisting crane comprising this jib also has identical technique effect, repeat no more here.
Above a kind of hoisting crane provided by the utility model and jib thereof are all described in detail.Apply specific case herein to set forth principle of the present utility model and embodiment, the explanation of above embodiment just understands method of the present utility model and core concept thereof for helping.Should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model principle, can also carry out some improvement and modification to the utility model, these improve and modify and also fall in the protection domain of the utility model claim.
Claims (9)
1. a jib for hoisting crane, comprises principal arm (10) and auxiliary (20), and both arm heads are separately installed with interior principal arm joint (111) and interior auxiliary joint (211);
It is characterized in that, also comprise swivel joint (40), itself and described interior principal arm joint (111) have the connecting bore cooperatively interacted; And described swivel joint (40) is movably connected in described interior auxiliary joint (211), to make it have two switchable states:
First state, described swivel joint (40) is fixedly connected with described interior auxiliary joint (211);
Second state, described swivel joint (40) and described interior auxiliary joint (211) are hinged, can rotate to the connecting bore of its connecting bore with described interior principal arm joint (111) align to make described swivel joint (40).
2. jib according to claim 1, is characterized in that, described swivel joint (40) is also provided with two pin-and-holes, coordinates respectively, form two groups of pin-and-holes with two pin-and-holes of described interior auxiliary joint (211);
Described swivel joint (40) is in the first state, and it runs through two groups of pin-and-holes respectively by two locationss and realizes and being fixedly connected with of described interior auxiliary joint (211);
Described swivel joint (40) is in the second state, and it runs through in two groups of pin-and-holes one group by a jointed shaft, and to realize with described interior auxiliary joint (211) hinged.
3. jib according to claim 2, it is characterized in that, described swivel joint (40) is platy structure, and two described pin-and-holes are located at the first end of described swivel joint (40) side by side, and described connecting bore is located at the second end of described swivel joint (40).
4. jib according to claim 3, is characterized in that, the first end of described swivel joint (40) is individual layer plate body, and the second end of described swivel joint (40) is the double-deck plate body be arranged in parallel.
5. jib according to claim 1, is characterized in that, described swivel joint (40) is Forging Parts or Casting Parts.
6. the jib according to any one of claim 1 to 5, is characterized in that, also comprises bracket component (30), and it is fixedly arranged on described principal arm (10) side; Off working state, described auxiliary (20) is supported by described bracket component (30) and is retrained.
7. jib according to claim 6, it is characterized in that, described bracket component (30) comprises the front frame (31) of close described principal arm (10) arm head and is positioned at the medium-height trestle (32) at described principal arm (10) middle part; Described auxiliary (20) can rotate around described front frame (31), and its rotary centerline is horizontally disposed with and perpendicular to the length direction of described principal arm (10).
8. jib according to claim 7, is characterized in that, described bracket component (30) also comprises the after poppet (33) near described principal arm (10) arm tail.
9. a hoisting crane, comprise chassis and be positioned at the jib on described chassis, it is characterized in that, described jib is the jib described in any one of claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420514082.7U CN204111219U (en) | 2014-09-05 | 2014-09-05 | A kind of hoisting crane and jib thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420514082.7U CN204111219U (en) | 2014-09-05 | 2014-09-05 | A kind of hoisting crane and jib thereof |
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| Publication Number | Publication Date |
|---|---|
| CN204111219U true CN204111219U (en) | 2015-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420514082.7U Expired - Fee Related CN204111219U (en) | 2014-09-05 | 2014-09-05 | A kind of hoisting crane and jib thereof |
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| Country | Link |
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| CN (1) | CN204111219U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104176657A (en) * | 2014-09-05 | 2014-12-03 | 徐州重型机械有限公司 | Crane and arm bracket thereof |
| CN113135511A (en) * | 2021-04-29 | 2021-07-20 | 徐州重型机械有限公司 | Main arm, crane and method for retracting auxiliary arm of crane |
-
2014
- 2014-09-05 CN CN201420514082.7U patent/CN204111219U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104176657A (en) * | 2014-09-05 | 2014-12-03 | 徐州重型机械有限公司 | Crane and arm bracket thereof |
| CN113135511A (en) * | 2021-04-29 | 2021-07-20 | 徐州重型机械有限公司 | Main arm, crane and method for retracting auxiliary arm of crane |
| CN113135511B (en) * | 2021-04-29 | 2024-05-14 | 徐州重型机械有限公司 | Main arm, crane and auxiliary arm retraction method of crane |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150121 Termination date: 20190905 |